It's not very cold where I live (bottoms out around 15 degrees F, usually above freezing) but I've come to like the feeling of cold air in the my lungs. I also

It's not very cold where I live (bottoms out around 15 degrees F, usually above freezing) but I've come to like the feeling of cold air in the my lungs. I also find it hard to run with a mask on. Of course this article is aimed at professional athletes in much colder conditions.